找不到请求的 .Net Framework 数据提供程序。它可能没有安装。答案

【问题标题】：Unable to find the requested .Net Framework Data Provider. It may not be installed.找不到请求的 .Net Framework 数据提供程序。它可能没有安装。
【发布时间】：2013-10-20 00:06:15
【问题描述】：

我已经搜索了答案，但找不到任何适合我的情况。

当我在本地运行该站点时，它完全可以正常工作，但是当我将它发布到 Azure 后，如果我尝试使用访问数据库的页面，它会给我以下错误页面：

Server Error in '/' Application.
--------------------------------------------------------------------------------


Unable to find the requested .Net Framework Data Provider.  It may not be installed. 
  Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. 

 Exception Details: System.ArgumentException: Unable to find the requested .Net Framework Data Provider.  It may not be installed.

Source Error: 


 An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.  

Stack Trace: 



[ArgumentException: Unable to find the requested .Net Framework Data Provider.  It may not be installed.]
   System.Data.Common.DbProviderFactories.GetFactory(String providerInvariantName) +1426271
   System.Data.Entity.Internal.LazyInternalConnection.CreateConnectionFromProviderName(String providerInvariantName) +12
   System.Data.Entity.Internal.LazyInternalConnection.InitializeFromConnectionStringSetting(ConnectionStringSettings appConfigConnection) +101
   System.Data.Entity.Internal.LazyInternalConnection.TryInitializeFromAppConfig(String name, AppConfig config) +32
   System.Data.Entity.Internal.LazyInternalConnection.Initialize() +127
   System.Data.Entity.Internal.LazyInternalConnection.get_ProviderName() +13
   System.Data.Entity.Internal.LazyInternalContext.InitializeContext() +346
   System.Data.Entity.Internal.InternalContext.GetEntitySetAndBaseTypeForType(Type entityType) +18
   System.Data.Entity.Internal.Linq.InternalSet`1.Initialize() +52
   System.Data.Entity.Internal.Linq.InternalSet`1.get_InternalContext() +15
   System.Data.Entity.Infrastructure.DbQuery`1.System.Linq.IQueryable.get_Provider() +37
   System.Linq.Queryable.Where(IQueryable`1 source, Expression`1 predicate) +63
   Dota2Finder.Controllers.HomeController.Generator(Int32 Start, Int32 End) +3287
   lambda_method(Closure , ControllerBase , Object[] ) +140
   System.Web.Mvc.ActionMethodDispatcher.Execute(ControllerBase controller, Object[] parameters) +14
   System.Web.Mvc.ReflectedActionDescriptor.Execute(ControllerContext controllerContext, IDictionary`2 parameters) +182
   System.Web.Mvc.ControllerActionInvoker.InvokeActionMethod(ControllerContext controllerContext, ActionDescriptor actionDescriptor, IDictionary`2 parameters) +27
   System.Web.Mvc.Async.<>c__DisplayClass42.<BeginInvokeSynchronousActionMethod>b__41() +28
   System.Web.Mvc.Async.<>c__DisplayClass8`1.<BeginSynchronous>b__7(IAsyncResult _) +10
   System.Web.Mvc.Async.WrappedAsyncResult`1.End() +50
   System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeActionMethod(IAsyncResult asyncResult) +32
   System.Web.Mvc.Async.<>c__DisplayClass39.<BeginInvokeActionMethodWithFilters>b__33() +58
   System.Web.Mvc.Async.<>c__DisplayClass4f.<InvokeActionMethodFilterAsynchronously>b__49() +225
   System.Web.Mvc.Async.<>c__DisplayClass37.<BeginInvokeActionMethodWithFilters>b__36(IAsyncResult asyncResult) +10
   System.Web.Mvc.Async.WrappedAsyncResult`1.End() +50
   System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeActionMethodWithFilters(IAsyncResult asyncResult) +34
   System.Web.Mvc.Async.<>c__DisplayClass2a.<BeginInvokeAction>b__20() +24
   System.Web.Mvc.Async.<>c__DisplayClass25.<BeginInvokeAction>b__22(IAsyncResult asyncResult) +99
   System.Web.Mvc.Async.WrappedAsyncResult`1.End() +50
   System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeAction(IAsyncResult asyncResult) +27
   System.Web.Mvc.<>c__DisplayClass1d.<BeginExecuteCore>b__18(IAsyncResult asyncResult) +14
   System.Web.Mvc.Async.<>c__DisplayClass4.<MakeVoidDelegate>b__3(IAsyncResult ar) +23
   System.Web.Mvc.Async.WrappedAsyncResult`1.End() +55
   System.Web.Mvc.Controller.EndExecuteCore(IAsyncResult asyncResult) +39
   System.Web.Mvc.Async.<>c__DisplayClass4.<MakeVoidDelegate>b__3(IAsyncResult ar) +23
   System.Web.Mvc.Async.WrappedAsyncResult`1.End() +55
   System.Web.Mvc.Controller.EndExecute(IAsyncResult asyncResult) +29
   System.Web.Mvc.Controller.System.Web.Mvc.Async.IAsyncController.EndExecute(IAsyncResult asyncResult) +10
   System.Web.Mvc.<>c__DisplayClass8.<BeginProcessRequest>b__3(IAsyncResult asyncResult) +25
   System.Web.Mvc.Async.<>c__DisplayClass4.<MakeVoidDelegate>b__3(IAsyncResult ar) +23
   System.Web.Mvc.Async.WrappedAsyncResult`1.End() +55
   System.Web.Mvc.MvcHandler.EndProcessRequest(IAsyncResult asyncResult) +31
   System.Web.Mvc.MvcHandler.System.Web.IHttpAsyncHandler.EndProcessRequest(IAsyncResult result) +9
   System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +9631764
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +155

这是我删除了用户名/密码/服务器的连接字符串。：

<add name="DefaultConnection" providerName="System.Data.SqlClient" connectionString="Server=<server>;Database=ELO;User ID=<username>;Password=<password>;Trusted_Connection=False;Encrypt=True;Connection Timeout=30;" />

虽然我不明白为什么它可以在本地工作，但不能在 Azure 上工作。该网站和 SQL 数据库托管在同一个帐户上。

【问题讨论】：

标签： c# sql-server asp.net-mvc azure

【解决方案1】：

对于 Azure，我发现我需要以下格式的连接字符串：

<add name="connectionName" connectionString="Data Source=servername.database.windows.net;initial catalog=databasename;persist security info=True;user id=userid;password=pwd;MultipleActiveResultSets=True;App=EntityFramework"  providerName="System.Data.SqlClient" />

关键区别似乎是Data Source=。

按照其他地方的建议，删除提供者名称并不是解决方案，因为它只会出现“providerName is missing”的错误。

【讨论】：

如果这不正确，请添加评论，而不仅仅是匿名投反对票。

【解决方案2】：

我通过在 Azure 门户中设置连接字符串而不是依赖我上传的 web.config 来解决此问题。这也更安全，因为我不必在我的 Web.Release.config 文件中拥有“生产”数据库连接的副本。连接字符串位于您网站底部附近的 CONFIGURE 选项卡下的 azure 管理门户中。

【讨论】：